The metropolitan France leveling network (mainland and Corsica) is subdivided into 4 increasingly dense levels called 1st, 2nd, 3rd, and 4th order.
Sources
- Les réseaux de nivellement français - Géodésie (geodesie.ign.fr)
- https://www.aftopo.org/lexique/nivellement-general-la-france-reseau-du/ (aftopo.org)
- https://bofip.impots.gouv.fr/bofip/5101-PGP.html/identifiant=BOI-CAD-TOPO-10-20120912 (bofip.impots.gouv.fr)
- https://bofip-archives.impots.gouv.fr/bofip/31037-AIDA.html/identifiant=11A4112-19900920 (bofip-archives.impots.gouv.fr)
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